RU2677387C1 - Controlled gas-magnetic bearing unit - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to the field of mechanical engineering and can be used in high-speed rotor-driven rotary machines. Managed gas-magnetic bearing unit contains a housing in which a sleeve bearing is installed, a shaft placed in the insert, an electromagnetic bearing containing more than one electromagnet, poles and yokes of electromagnets installed in a housing, windings of electromagnets located on the yokes, gap measurement sensors. Poles and the yoke of the electromagnets are installed transversely in the liner of the gas-dynamic sliding bearing and in the housing, in which the shaft speed measurement sensor and the gap measurement sensors are installed. Petals are mounted on the inner surface of the liner.

EFFECT: improvement of dynamic characteristics, increase of reliability and resource of the "rotor – support" system.

1 cl, 2 dwg

Description

The invention relates to the field of mechanical engineering and can be used in rapidly rotating highly loaded rotary machines.

As a prototype of this technical solution, a controllable gas-magnetic bearing assembly is selected, comprising a housing in which a liner of a gas-static sliding bearing is installed, a shaft located in the liner, an electromagnetic bearing containing more than one electromagnet, poles and yoke of electromagnets mounted longitudinally in the housing, electromagnet windings, located on the yokes, holes for porous inserts located in the liner of the plain bearing, a chamber for supplying gas lubricant to the porous inserts located between the plain bearing shell and the housing, an opening made in the housing for supplying gas lubricant to the chamber, as well as clearance measurement sensors mounted on the poles of the electromagnets. (Patent RU No. 2545146, IPC F16C 32/04, F16C 39/06, published March 27, 2015).

The disadvantage of this controllable gas-magnetic bearing is the use of a gas-static bearing with a rigid bearing surface, which has less damping compared to a gas bearing with an elastic bearing surface, as well as the inability to determine the shaft speed, which does not allow controlling the bearing assembly at different shaft speeds, so how with increasing shaft speed in a gas bearing a gas-dynamic force arises and increases, which leads to redistribution the division of reactions between the gas and electromagnetic bearings, which is not taken into account when controlling electromagnets.

The technical problem that this invention solves is the improvement of dynamic characteristics, increasing the reliability and service life of the rotor-support system through the use of a lobe gas-dynamic bearing and a shaft speed sensor.

This object is achieved in that the controlled gas-magnetic bearing assembly comprises a housing in which a sliding bearing shell is mounted, a shaft located in the shell, an electromagnetic bearing comprising more than one electromagnet, poles and yokes of electromagnets installed in the housing, electromagnet windings located on yokes, gap measurement sensors. According to the invention, the poles and yokes of the electromagnets are mounted transversely in the insert of the gas-dynamic sliding bearing and in the housing in which the shaft speed measuring sensor and the clearance measuring sensors are installed, and the petals are mounted on the inner surface of the insert.

The technical result of the use of this device is to improve the dynamic characteristics, increase the reliability and service life of the rotor-support system.

The invention is illustrated by drawings.

In FIG. 1 shows a controllable gas-magnetic bearing assembly with spring-loaded elastic petals (transverse section); in FIG. 2 shows a controllable gas-magnetic bearing assembly with elastic petals pressed from the shaft (longitudinal section).

The bearing assembly (Fig. 1) contains a housing 1 in which a liner 2 of a gas-dynamic sliding bearing is mounted, on the inner surface of which elastic petals 3 are mounted, a shaft 4 placed in the liner 2, an electromagnetic bearing 5 containing more than one electromagnet 6.

The bearing assembly (Fig. 2) further comprises poles 7 and yoke 8 of electromagnets 6 mounted transversely in the housing 1 and in the insert 2, windings 9 of electromagnets 6 located on yokes 8, clearance measurement sensors 10, and shaft rotation speed measurement sensor 11, 4 mounted in the housing 1.

The device operates as follows.

In the initial period of time, the shaft 4 is stopped, and the load is transferred from the shaft 4 to the housing 1 through the elastic lobes 3. Based on the data received from the sensors 10 for measuring the clearance and the sensor 11 for measuring the speed of the shaft 4, the magnetic force is controlled, which is controlled by due to changes in the current flowing through the windings 9 of the electromagnets 6. Regulation is performed for each electromagnet 6 separately. The generated magnetic force transfers the load from the shaft 4 to the housing 1. In this case, the elastic petals 3 are pressed out from the shaft 4 under the action of magnetic force, as a result of which a gap is formed between the shaft 4 and the petals 3, filled with lubricant.

With an increase in the rotation speed of the shaft 4, a gas-dynamic reaction occurs in the lubricant, due to which a redistribution of reactions occurs between the gas-dynamic bearing and the electromagnetic bearing 5. As a result, the load from the shaft 4 on the housing 1 is additionally carried out through the lubricating layer of the gas-dynamic bearing and elastic petals 3.

Claims (1)

A controllable gas-magnetic bearing assembly comprising a housing in which a plain bearing shell is installed, a shaft housed in the shell, an electromagnetic bearing comprising more than one electromagnet, poles and yokes of electromagnets installed in the housing, electromagnet windings located on yokes, clearance measurement sensors, characterized the fact that the poles and yokes of the electromagnets are mounted transversely in the liner of the gas-dynamic sliding bearing and in the housing in which the rotational frequency measurement sensor is installed shaft shaft and clearance measurement sensors, and petals are mounted on the inner surface of the liner.

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